SPSC ZOOLOGY 25 YEARS PAST PAPERS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
زیادہ تر خلیاتی رطوبت اس وقت ہوتی ہے جب کوئی الرجین کس کے ساتھ ملتا ہے؟
- IgG antibodies
- IgE antibodies
- IgM antibodies
- IgA antibodies
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Explanation
- IgE antibodies are responsible for allergic reactions.
- When an allergen binds with IgE, it activates mast cells.
- This leads to the release of histamine and other chemicals.
- These chemicals cause allergy symptoms like itching, swelling, and sneezing.
Last verified on 04-06-2026
جب آبادی چھوٹی ہو تو کس چیز کا زیادہ امکان ہوتا ہے؟
- Gene flow
- Genetic drift
- Natural selection
- Sexual selection
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Explanation
- Genetic drift is the random change in gene frequencies in a population.
- It has a stronger effect in small populations.
- In small populations, chance events can strongly change allele frequencies.
- It can lead to loss of genetic variation over time.
Last verified on 04-06-2026
ٹرانسکرپشن کے لیے درکار انزائم کون سا ہے؟
- RNAase
- Endonucleases
- RNA polymerase
- DNA polymerase
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Explanation
- RNA polymerase is the enzyme required for transcription.
- It helps in synthesizing RNA from a DNA template.
- Transcription is the first step of gene expression.
- It occurs in the nucleus of eukaryotic cells.
- RNA strand is formed complementary to DNA.
Last verified on 04-06-2026
کوئلے کے ذخائر کے لیے کاربونیفیرس دور کب تھا؟
- 50 mya
- 500 mya
- 2000 mya
- 300 mya
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Explanation
- Carboniferous period of coal deposition was mainly took place around 300 million years ago.
- The Carboniferous period is known for extensive coal formation.
- It occurred during the late Paleozoic Era.
Last verified on 04-06-2026
ڈروسوفیلا میں جنس کے تعین کے پیچیدہ طریقہ کار کی وضاحت کے لیے پیش کردہ نظریہ کون سا ہے؟
- Linage theory
- Genetic balance theory
- Mosaics theory
- Classical theory
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Explanation
- The genetic balance theory explains sex determination in Drosophila.
- It was proposed to explain the ratio of X chromosomes to autosomes.
- Sex is determined by the balance between X chromosomes and autosomal genes.
- It helps explain male and female development in fruit flies.
Last verified on 04-06-2026
جے شکل گروتھ کَرْو درج ذیل میں سے کن چیزوں سے وابستہ ہوتا ہے؟
- Exponential growth
- Biotic potential
- Unlimited resources
- All of these
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Explanation
- A J-shaped growth curve represents exponential population growth.
- It occurs when resources are unlimited.
- Organisms reproduce at their biotic potential.
- Growth continues rapidly without environmental resistance.
Last verified on 04-06-2026
شہتوت کے سلک کیڑا ______ ہے؟
- Anthraea mylitta
- Bombyx mori
- Attacus atlas
- None of these
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Explanation
- Bombyx mori, which is the scientific name for the Mulberry silkworm.
- This species is widely cultivated for its silk production.
- It is often referred to as the "Domesticated silkworm" or simply "Silkworm".
Last verified on 04-06-2026
- Acidic
- Alkaline
- Variable
- Neutral
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Explanation
- Blood in humans is slightly alkaline in nature.
- Its normal pH ranges from 7.35 to 7.45.
- This balance is important for proper body functions.
- Even small changes in pH can affect health.
Last verified on 04-06-2026
وہ فلیمینٹس جو خلیے کے اندر آرگنیلز کو حرکت دینے میں مہارت رکھتے ہیں، کون سے ہیں؟
- Microfilaments
- Intermediate filaments
- Actin
- Microtubules
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Explanation
- Microtubules are cytoskeletal filaments responsible for movement inside cells.
- They help in transporting organelles within the cell.
- They also play a key role in cell division.
- They act as “tracks” for intracellular movement.
Last verified on 04-06-2026
مندرجہ ذیل میں سے کون سا جوڑا درست مطابقت نہیں رکھتا؟
- Coral snake
- Glass snake
- Sea snake
- Rattle snake
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Explanation
- Glass snake is actually not a true snake.
- It is a legless lizard that resembles a snake.
- Coral snake → True snake
- Sea snake → True snake
- Rattlesnake → True snake
Last verified on 04-06-2026
